Blood vessel determination device, blood vessel determination method and non-transitory storage medium

Abstract

A blood vessel judgment device acquires an image captured while near-infrared light is illuminated at a part of a body. Based on brightness values of a plurality of pixels configuring the acquired image, the blood vessel determination device determines that a predetermined number of pixels counted in order of brightness value from a pixel with a lowest brightness value represent blood vessels.

What is claimed is: 
     
         1 . A blood vessel determination device, comprising:
 a memory; and   a processor coupled to the memory, the processor being configured to:   acquire an image captured while near-infrared light is illuminated at a part of a body, and,   based on brightness values of a plurality of pixels configuring the acquired image, determine that a predetermined number of pixels counted in order of brightness value from a pixel with a lowest brightness value represent blood vessels.   
     
     
         2 . The blood vessel determination device according to  claim 1 , wherein the processor is configured to:
 determine that a first predetermined number of pixels counted in order of brightness value from the pixel with the lowest brightness value represent blood vessels, and   determine that a second predetermined number of pixels counted in order of brightness value from a pixel with a highest brightness value do not represent blood vessels.   
     
     
         3 . The blood vessel determination device according to  claim 2 , wherein the processor is further configured to:
 arrange the brightness values of the plurality of pixels configuring the acquired image in ascending order, and   based on the arranged brightness values of the plurality of pixels,
 determine that the first predetermined number of pixels counted from the pixel with the lowest brightness value represent blood vessels, and 
 determine that the second predetermined number of pixels counted from the pixel with the highest brightness value do not represent blood vessels. 
   
     
     
         4 . The blood vessel determination device according to  claim 1 , wherein the part of the body is a finger. 
     
     
         5 . The blood vessel determination device according to  claim 2 , wherein the processor is further configured to:
 acquire a plurality of the images, which are captured at a predetermined time interval, by averaging brightness values of pixels at corresponding positions contained in the plurality of images, generate an averaged image in which the plurality of images are averaged,   based on brightness values of a plurality of pixels configuring the averaged image that is generated, determine that the first predetermined number of pixels counted from the pixel with the lowest brightness value represent blood vessels, and   determine that the second predetermined number of pixels counted from the pixel with the highest brightness value do not represent blood vessels.   
     
     
         6 . The blood vessel determination device according to  claim 1 , wherein the processor is further configured to:
 determine that, among pixels with higher brightness values than a first threshold value, a first predetermined number of pixels counted from a pixel with a lowest brightness value represent blood vessels; and   determine that, among pixels with lower brightness values than a second threshold value, a second predetermined number of pixels counted from a pixel with a highest brightness value do not represent blood vessels.   
     
     
         7 . A blood vessel determination method, comprising, by a computer:
 acquiring an image captured while near-infrared light is illuminated at a part of a body; and,   based on brightness values of a plurality of pixels configuring the acquired image, determining that a predetermined number of pixels counted in order of brightness value from a pixel with a lowest brightness value represent blood vessels.   
     
     
         8 . A non-transitory storage medium storing a blood vessel determination program that is executable by a computer to perform processing, the processing comprising:
 acquiring an image captured while near-infrared light is illuminated at a part of a body; and,   based on brightness values of a plurality of pixels configuring the acquired image, determining that a predetermined number of pixels counted in order of brightness value from a pixel with a lowest brightness value represent blood vessels.